The brownish-yellow discharge found in one's undergarment after an evening of junk food and/or bad beer. It can be delivered by flatulence, or a steady leak.
by biggdogg September 4, 2003
Hot Yellow Ass Mustard: the result of anally straining oneself beyond one's limits then exposing that matter to a heated element.
After we ate the bean burrito we had a farting contest in which Matt pushed too hard and sprayed ass mustard all over the space heater causing it to become hot yellow ass mustard.
by Frankendouche August 30, 2005
Someone whose ass emits an odor strong enough to create casualties reminiscent of WWI's Mustard Gas.
by Krazy Kraka February 24, 2004